Field performance of RAS test sections and laboratory investigation of impact of rejuvenators on engineering properties of RAP/RAS mixes.

Details

• Creators:
  Im, Soohyok ; Zhou, Fujie
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Pavement design
  • Recycled materials
  • Field tests
  • Laboratory tests
  • Asphalt pavements
  • Benefit cost analysis
  • Cracking
  • Mix design
  • Reclaimed asphalt pavements
  • Pavement performance
• Publication/ Report Number:
  FHWA/TX-14/0-6614-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas Department of Transportation. Research and Technology Implementation Office
• Abstract:
  In the last several years, recycled asphalt shingles (RAS), in addition to reclaimed asphalt pavement (RAP), ; have been widely used in Texas. The use of RAS can significantly reduce the cost of asphalt mixtures, conserve ; energy, and protect the environment. However, one of the major concerns is poor cracking resistance of RAS mixes ; due to super stiff asphalt binder in the RAS. This research focused on field performance of RAS test sections and ; the benefit of using rejuvenators in improving cracking resistance of RAS(/RAP) mixes. In addition, a simple cost ; analysis was performed to investigate the cost-benefits of using rejuvenators. It was found that both increasing ; design density (leading to higher virgin binder content) and using soft virgin binders (e.g. PGXX-28) can improve ; cracking resistance. With respect to improving cracking resistance of RAS mixes, the three rejuvenators evaluated ; in this research are all effective. Furthermore, the incorporation of rejuvenators also improved the moisture ; susceptibility and rutting resistance of the mixtures containing recycled materials. Apparently, additional tests and ; analyses are necessary. Specifically, field test sections with different types of rejuvenators should be constructed ; for further evaluation. ; Additionally, the observed field performance indicated that cracking performance is influenced by many ; factors, such as traffic, climate, existing pavement conditions for asphalt overlays, and pavement structure and layer ; thickness. It is extremely difficult to propose a single cracking requirement for all applications. There is a need to ; develop a RAP/RAS mix design and performance evaluation system for project-specific service conditions, ; including traffic, climate, existing pavement conditions, etc.
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• Format:
  PDF
• Funding:
  Project 0-6614
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27281/dot_27281_DS1.pdf
• File Type:
  [PDF - 2.28 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0feb7fc280e4984a4b29eb8b19a25e7286dc076eafe0d62d712b320a86b97bf1084539ac65d10cab3f0b38734571bcdda0a77b10808e91407a9ed0cc3a466aa7